Poster (Scientific congresses and symposiums)
Tailoring the superconducting properties of niobium nanoconstrictions via electro-annealing
Lombardo, Joseph; Baumans, Xavier; Jelic, Zeljko et al.
201728th International Conference on Low Temperature Physics
 

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Keywords :
superconductivity; niobium; Josephson effect; electromigration; electro-annealing; weak-link; supraconductivité; jonction Josephson; Josephson; jonction faible
Abstract :
[en] In this work we report the possibility to create weak links in nanostructured Nb thin films using electro-annealing. By using electron-assisted atom diffusion in Nb nanconstrictions, we were able to locally change the material properties (superconducting critical temperature and normal resistance). When the critical temperature of the nanoconstriction is sufficiently decreased, the field dependence of the critical current exhibits a Fraunhofer-like pattern, confirming the formation of the weak link. Scanning electron microscopy images clearly reveals the structural change underwent by the constriction resulting from the effect of the high current density. Numerical simulations within the Ginzburg-Landau formalism are also presented. These findings represent the first evidence of weak link formation by electro-annealing and provide an easy method for the fabrication of Josephson junctions with tunable resistance and critical temperature in Nb thin films.
Research center :
Département de Physique, Université de Liège
Disciplines :
Physics
Author, co-author :
Lombardo, Joseph  ;  Université de Liège > Département de physique > Physique expérimentale des matériaux nanostructurés
Baumans, Xavier ;  Université de Liège > Département de physique > Physique expérimentale des matériaux nanostructurés
Jelic, Zeljko ;  Université de Liège > Département de physique > Physique expérimentale des matériaux nanostructurés
Scheerder, Jeroen;  Katholieke Universiteit Leuven - KUL > Institute for Nanoscale Physics and Chemistry > Laboratory of Solid State Physics and Magnetism
Moschalkov, Victor V.;  Katholieke Universiteit Leuven - KUL > Institute for Nanoscale Physics and Chemistry > Laboratory of Solid State Physics and Magnetism
Milosevic, Milorad;  Universiteit Antwerpen - UA > Departement Fysica
Van de Vondel, Joris;  Katholieke Universiteit Leuven - KUL > Institute for Nanoscale Physics and Chemistry > Laboratory of Solid State Physics and Magnetism
Kramer, Roman B. G.;  Centre National de la Recherche Scientifique - CNRS > Institut NÉEL > Quantum Coherence
Silhanek, Alejandro  ;  Université de Liège > Département de physique > Physique expérimentale des matériaux nanostructurés
Language :
English
Title :
Tailoring the superconducting properties of niobium nanoconstrictions via electro-annealing
Alternative titles :
[fr] Ajustement des propriétés supraconductrices des nanoconstrictions de niobium par électro-annealing
Publication date :
10 August 2017
Number of pages :
A0
Event name :
28th International Conference on Low Temperature Physics
Event organizer :
Chalmers University of Technology
Event place :
Gothenburg, Sweden
Event date :
du 9 août 2017 au 16 août 2017
Audience :
International
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 07 September 2017

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